Pulse

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Pulse
Diagram of the rise and lower of blood from a pulse.
Organisms	Animalia*
Biological system	Circulatory system
Action	Involuntary
Method	Heart pumps blood using reciprocating method causing inconstant blood flow throughout the circulatory system that can be recognized. (See Cardiac cycle)
Frequency	60–100 per minute (humans)
Duration	0.6–1 second (humans)
Animalia with the exception of Porifera, Cnidaria, Ctenophora, Platyhelminthes, Bryozoan, Amphioxus.

In medicine, the pulse refers to the rhythmic pulsations (expansion and contraction) of an artery in response to the cardiac cycle (heartbeat).^[1] The pulse may be felt (palpated) in any place that allows an artery to be compressed near the surface of the body close to the skin, such as at the neck (carotid artery), wrist (radial artery or ulnar artery), at the groin (femoral artery), behind the knee (popliteal artery), near the ankle joint (posterior tibial artery), and on foot (dorsalis pedis artery).^[2][1] The pulse is most commonly measured at the wrist or neck for adults^[3] and at the brachial artery (inner upper arm between the shoulder and elbow) for infants and very young children.^[4] A sphygmograph is an instrument for measuring the pulse.^[5]